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Sears 17.5hp Kholer ohv engine. If I remove the spark plug the engine spins very well. When I install the spark plug...I don't believe it makes a full spin and the engine just stops. I have a new battery, changed the oil. The previous owner had too much oil in the crankcase. Oil was well above the full mark and it was dirty. I can move the engine by turning it by hand on top and I can feel when the pressure is out of the cylinder. That's when I try to start and again it may spin one or two times then locks up again. No noise just stops as if there is to much pressure inside the cylinder. Could a valve be stuck closed and if so, is this a job for a backyard mechanic to tackle?

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Your problem is simple to explain, but unfortunately expensive to repair. Inside the engine atached to the cam is a small device called an Automatic Compression Release or ACR. It mounts on to a pin and it has a spring. One or the other or both are broken. When you remove the plug, it turns over easy because there is no compression to hold it back. Once you put the plug back in, its the job of the ACR to raise the valve just enough to get the engine started then it closes to let the engine run. The engine will have to be removed and the case split to replace it. I hate giving bad news. George

Posted on Oct 18, 2013

  • Robert
    Robert Oct 18, 2013

    Thank you, George. I really appreciate your advice.



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Posted on Jan 02, 2017

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SOURCE: 13.5hp Briggs And Stratton snowblower.I tried to

Concerning your starter/pull cord problem, what has probably happened is that due to sitting idle for an extended period, the pinion gear had stuck in the down position on the clutch drive.

When you engaged it with power it spun as it was supposed to do but did not immediately spin up into the ring gear.

After you released the starter button and it began to slow down the gear spun up into the flywheel and jammed because it didn't have enough power to turn the engine.

A usually simple fix for this is to turn the engine backward by hand just enough to relieve the tension and the return spring will push the gear back down.

At this point, you can try the electric starter again and it should work properly. If it does not work, you will have to remove the starter and clean and inspect the starter drive on the top of the starter.

Concerning the fact that it would not start, you more than likely have some old fuel trapped in the bottom of the float bowl.

You may be able to remedy this by spraying some carburetor cleaner in the carb while trying to start it.

If it has spark and everything else is in good condition, it will start and run as long as it has carb cleaner getting to the engine so you may need to spray it a few times while it is running on that and sometimes the stale fuel problem will clear itself.

If it doesn't clear up and run on its own without the carb cleaner after 3 or 4 shots of spray you will need to remove the float bowl and clean it and the main jet with the carb cleaner.

Protect your eyes and bare skin while using the carburetor cleaner, it will injure you. Do not spray it on any rubber gaskets or seals, it will swell and ruin them.

Sorry for the "book" I wrote but I am trying to explore as many possibilities as I can to get you up and snow blowing!

Posted on Nov 05, 2009

Testimonial: "Cured the problem just like you said. Thanks"

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SOURCE: 7Hp OHV Briggs & Straton Craftsman Front Propelled Smokes

Sounds like it is the valve seats. However normally it will stop smoking after is runs for a while if that is the problem. Does it run good? Because if it isn't the valve seats then it is the rings. Or a big scratch in the cylinder wall. Then most of the time it will loose compression. If it isn't smoking real bad then you can get an additive to put with your oil that will make it stop, maybe? It is about ten dollars and you can get is at most autoparts stores. It will just take a couple ounces of it. Follow the directions for how many qts of oil you have. After you change the oil in the motor take a magnet and run it through the oil and see if there is pieces of the rings in it.

Posted on Jul 12, 2010

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SOURCE: Hello' My issues is as follow: my MTD PRO Hydrostatic 18.0 HP 1/C OHV, I have gas runing inside of the oil compartment; as well as, inside were the Spark plugs should be? do know what is the pro

Th carb needle is leaking, with an internally vented carb there is the possibility for the fuel to flow through the open inlet valve if the carb needle is not shutting the fuel off, if this happens after the machine has been left, just fit an inline fuel tap in the fuel hose, however the needle valve will have to be changed at some point.

Posted on Apr 25, 2012

Testimonial: "Yes it was?' Thanks you Mr. ANDREW WHITE, and all the others person at FIX-YA helpful solution. Really' thanks you! all so very very much for a job well done. For all of your helps, in giving me the completed details. In order to answers my current MTD - PRO Riding Lawn Mower solutions issues......"

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SOURCE: Toro zero turn mower does not want to start

i think that engine has a compression release arm on the camshaft f its not releasing it will be hard to crank over

Posted on Sep 29, 2012

Testimonial: "Mike was correct... The fix was simply 'adjust the valves'. This apparently affects that 'compression release valve' that mike spoke of. We measured the exhaust clearance-- it was .063" We reset it to the recommended .007" (what a difference) The intake valve clearance measured .025" We reset it to the recommended .005" I don't understand the design mechanics of the 'compression realse valve'... or where its located... but it definatly works. Anyone know where to find the exploded view of this Briggs?"

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SOURCE: I have a 1993 Kohler CH18 engine. I was mowing the lawn and the engine started losing power. I was able to make a couple more rounds and finish mowing. I then noticed that the low oil light was on.

a plugged passage will block of the flow

Posted on Oct 15, 2012

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From your description it seems that the starter is not engaging to turn over the engine. First ensure all the connections of the thicker cables to the battery, starter and tractor frame are clean and tight. If starter motor is turning but still not engaging it will mean that the pinion on the starter motor is binding on the shaft. You can buy a new starter pinion gear from your local B & S agent.
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So have you actually checked spark to both plugs? If so then inspect valves to be sure valves are operating. Sounds like running on one cylinder. A quick check would be to unplug one spark plug at a time. You may find if you remove the dead plugh wire, there is no change. If you unplug the running cylinder it probably won't start. Sometimes the compression release mechanisms can come apart or come loose. Download your manual for you engine model at

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I need the diagram to put the spark plug cables

2003 Chevrolet Malibu 3.1L SFI OHV 6cyl
Spark Plug Wires - Removal & Installation

3.5L Engine
  1. Before servicing the vehicle, refer to the Precautions Section.
    NOTE Twist the spark plug boot one-half turn in order to release the boot. Pull on the spark plug boot only. Do not pull on the spark plug wire or the wire could be damaged.
  2. Remove the intake manifold cover, if required.
  3. Disconnect the left side spark plug wires from the spark plugs.
  4. Disconnect the left side spark plug wires from the ignition coil.
  5. Remove the spark plug wire clips from the Manifold Absolute Pressure (MAP) sensor bracket and the heater inlet and outlet pipe tab.
  6. Remove the spark plug wire assembly.
  7. If replacing only one plug wire, open the retaining clips and remove the appropriate spark plug wire.
  8. Disconnect the right side spark plug wires from the spark plugs.
  9. Disconnect the right side spark plugs from the ignition coils.
  10. Remove the spark plug wire assembly.
  11. If replacing only one plug wire, open the retaining clip and remove the appropriate spark plug wire.
To install:
  1. Install the spark plug wire assembly.
  2. Connect the right side spark plugs to the ignition coils.
  3. Connect the right side spark plug wires to the spark plugs.
  4. If replacing only one plug wire, open the retaining clip and install the appropriate spark plug wire.
  5. Install the spark plug wire assembly.
  6. Connect the left side spark plug wires to the spark plugs.
  7. Connect the left side spark plug wires to the ignition coil.
  8. Install the spark plug wire clips to the MAP sensor bracket and the heater inlet and outlet pipe tab.
  9. If replacing only one plug wire, open the retaining clips and install the appropriate spark plug wire.
  10. Install the intake manifold cover, if required.

Fig. 2.2L Engine Firing Order: 1-3-4-2 Distributorless ignition system

Fig. 3.1L Engine Firing order: 1-2-3-4-5-6 Distributorless ignition system

Fig. 3.5L Engine Firing order: 1-2-3-4-5-6 Distributorless ignition system

Fig. 2.4L Engine Firing order: 1-3-4-2 Distributorless ignition system

Fig. 3.1L Engine Firing order: 1-2-3-4-5-6 Distributorless ignition system

Fig. 2.2L Engine Firing Order: 1-3-4-2 Distributorless ignition system

Fig. 3.5L & 3.9L Engines Firing order: 1-2-3-4-5-6 Distributorless ignition system

I really hope help you with this (remember rated this help) Good luck.

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